Relationship between Unequal Sides of Triangle and the Angles Opposite to It.
In the figure...
Question
In the figure given below, AC = AD. Choose the correct relation between AB and AD.
A
AB > BD
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B
AB = BD
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C
AB < BD
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D
Cannot be determined
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Solution
The correct option is A AB > BD
In ΔABC and ΔACD, ∠1=∠3+∠4 [Exterior angle property of a triangle]
But ∠1=∠2 (∵AC=AD and angles opposite to equal sides are equal) ⇒∠2=∠3+∠4 ⇒∠2>∠3
Hence, AB>AD. [Side opposite to greater angle is larger as compared to smaller angle]